From Portugal to Sweden, European countries are becoming harder to govern, and their economic reforms more difficult to implement, as a prolonged financial crisis brings weaker and more divided governments.

The arrival of a wave of refugees and migrants fleeing war, repression and poverty in the Middle East, Asia and Africa may even amplify those political trends, boosting anti-immigration populists and sapping the traditional parties of government.

The center-right was the main electoral beneficiary of the eurozone's financial crisis before the migration surge struck, but it faces increased pressure to adopt the discourse and policies of resurgent far-right Euroskeptic groups.